Year	Annual Number
1970	26
1971	0
1972	100
1973	0
1974	0
1975	47
1976	0
1977	0
1978	0
1979	0
1980	61
1981	212
1982	0
1983	0
1984	10920
1985	0
1986	36
1987	0
1988	20000000
1989	0
1990	0
1991	55880
1992	0
1993	40270
1994	0
1995	0
1996	0
1997	156500
1998	0
1999	478000
2000	0
2001	6342000
2002	202
2003	0
2004	0
2005	157900
2006	0
2007	0
2008	0